Nα-benzyloxycarbonyl-Nε-tert-butyloxycarbonyl-lysyl-serine
glycylglycine benzyl ester p-toluene sulfonate salt
N2-benzyloxycarbonyl-N6-t-butoxycarbonyl-L-lysine 4-nitrophenyl ester
Boc-Gln-ONp
N-tert-butyloxycarbonyl-glutamyl-glycylglycine benzyl ester